Can you identify one apple from another apple? Only if you are the owner of the apple orchard or you planted those seeds one by one and then sort them out and identify it one by one. There are at least 30 different species of apple, so far. Bees and other insects help in the pollination process. Grafting also makes it possible to breed one apple variety to another apple variety.
Have you seen peaches and nectarines that looked like apples?
Know what? I happened to see group of peaches that looked like apples. Of course inside those peaches, the differences would be the color of the flesh and the seeds (and stones) inside to taste the peaches from apples? Big difference.
It's true you can't judge the book by its cover and that too proves true with apples and peaches. Salmons and tuna? One particular salmon, the chinooks that resembles tuna in taste and flavour when its cooked.
How about to identify one variety of sunflower to another sunflower species? There are several species of sunflowers nowadays and the variation would be in sizes, shapes, colors and floret disks.
Nothing is the same, even identical twins have differences. It's just that some humans have sharper visions and other humans have poor visions.
Poor visions become a hindrance to many of us especially those who are working in the Bureau of Identification. There are high-tech machines that are being used for face recognition process and that too is not 100% accurate. In all these cases, TRUST is something we all have to live by or we all are subjected to wiping out the human race. You have to learn to identify humans from animals. You have to learn to identify people as humans not machines. If you cannot identify your own kind then there is something with your mind.
Mental Health issue becomes the conflict in every assessment and if you are starting to act as animal you are to become part of the ZOO. That's primal fear for you.